On 7/7/07, Dave LeCompte (really) <dave@xxxxxxxxxxxx> wrote:
"Ian Mallett" <geometrian@xxxxxxxxx> wrote:
> Try looking at glOrtho2D() or something like that...
Yes, glOrtho() or glOrtho2D() both work.
> Why do you want to use
> PyOpenGL for 2D-ness? It's much better suited to 3D stuff.
Well, just because OpenGL was designed for 3D doesn't mean it's not also a
very good tool for 2D.
Some reasons I prefer OpenGL for 2D to SDL's drawing code:
- performance
- sub-pixel positioning
- scaling/rotation
- blending
- vertex coloring
- lots of good documentation, lots of sample code, lots of tips on
optimizing performance available on the web
Basically, a lot of the graphical features I might want to use in a 3D
renderer, I might also want to use in a 2D renderer.
> I've always
> found it easier to use pygame for 2D games. Oh, and ummm... Don't tell
> Silicon Graphics, but I've found pygame is much much faster at 2D.
I'm in the other camp - I find OpenGL easy and fast, and if I want to
reuse code from a 2D game in a later 3D project, the port will be much
easier than if I have to rewrite it from SDL to OpenGL.
Yes, by far an large, OpenGL is better at 3D, but 2D? I don't know. My experience has been that OpenGL is slower, but then again, I was new to that sort of thing. It would be good to run a few tests to confirm one way or the other. And yes, you are right. Porting code would be much easier without those changes.
-Dave LeCompte